21172011488 has 24 divisors (see below), whose sum is σ = 41712842808. Its totient is φ = 10578273664.

The previous prime is 21172011473. The next prime is 21172011533. The reversal of 21172011488 is 88411027112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197006 + ... + 284877.

It is an arithmetic number, because the mean of its divisors is an integer number (1738035117).

Almost surely, 2^21172011488 is an apocalyptic number.

It is an amenable number.

21172011488 is a deficient number, since it is larger than the sum of its proper divisors (20540831320).

21172011488 is a wasteful number, since it uses less digits than its factorization.

21172011488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483266 (or 483258 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 35.

The spelling of 21172011488 in words is "twenty-one billion, one hundred seventy-two million, eleven thousand, four hundred eighty-eight".